Download 28Newtons-Laws-Test - Mr-Hubeny

Answer all questions on white lined of paper! Show work for problems for full credit!
Newton's Laws Quiz
Multiple Choice (2pts each)
Identify the letter of the choice that best completes the statement or answers the question.
1.
The force of gravity is weaker between two objects that
a. have large masses.
c. have a large distance between them
b. have rougher surfaces.
d. are moving at greater speed.
2. How much force is needed to accelerate a 70 kg rider and her 200 kg motor scooter at 4 m/s/s?
a. 270 N
c. 800 N
b. 280 N
d. 1,080 N
3. When your are in a car and it takes a sharp turn , you tend to slide in your seat because of
a. air resistance.
c. gravity.
b. inertia.
d. friction.
4. Gravitational force increases as
a. acceleration increases.
b. mass increases.
c.
d.
distance increases.
velocity increases.
5. Use Newton's second law of motion to calculate the acceleration of a 7 kg mass if a force of 68.6 N acts on it?
a. 0.1 m/s/s
c. 68.6 m/s/s
b. 9.8 m/s/s
d. 480.2 m/s/s
6. Newton's third law of motion states that whenever one object exerts a force on a second object,
a. the second object exerts an equal and opposite force on a third object.
b. the first object is unaffected by that force.
c. the second object exerts an equal and opposite force on the first object.
d. the second object exerts a less powerful force on the first object.
7. According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will
a. remain in motion.
c. transfer its energy to another object.
b. eventually come to a stop.
d. accelerate in the absence of friction.
8. A 5 kg object has less inertia than a ____ object. (1 kg = 1,000 g)
a. 4 kg
c. 2 kg
b. 6,000 g
d. 1,500 g
9. A force
a. is expressed in newtons.
b. can cause an object to speed up, slow down, or change direction.
c. is a push or a pull.
d. All of the above
10. Newton's second law of motion states that an object's acceleration
a. increases as its mass decreases and as the force acting on it increases.
b. decreases as its mass decreases and as the force acting on it increases.
c. increases as its mass increases and as the force acting on it increases.
d. decreases as its mass increases and as the force acting on it increases.
11. A truck pulls a 2,000 kilogram car with a net force of 4,000 Newton’s. What is the acceleration of the car?
a 1/2 m/s²
b 2 m/s²
c 200 m/s²
d 2,000 m/s²
12. An astronaut on the moon is holding a baseball and a feather. He drops both objects at the same time. What happens?
a) The baseball falls slower than the feather
b) The baseball falls faster than the feather
c) The baseball and the feather fall at the same rate
d) The baseball and the feather do not fall
13. Mike and Matt are pushing a heavy bookcase across the floor. To reduce the amount of friction they need to go against,
what should they do?
a) Put sand down on the floor to increase the roughness of the surface the bookcase slides on
b) Take the books off the bookcase first to decrease the mass of the bookcase
c) Add more mass to the bookcase so it will slide easier
d) Cry for their mommas
14. The moon orbits the Earth in a circular orbit due to the Earth’s gravitational force that pulls the moon towards the Earth.
This inward force that causes the moon’s circular motion is a type of:
a) centrifugal force
b) friction force
c) centripetal force
d) magnetic force
Use the diagram below to answer questions 15-17:
5N
15N
15. What is the net force on the box?
a) 15N
b) 10N
c) 5N
d) 20N
16. In which direction does the box accelerate?
a) To the right
b) To the left
c) Up
d) Neither right or left, there is no acceleration
17. If the box has a mass of 2kg, what would the acceleration of the box be based upon the net force given to it.
a) 10m/s2
b) 20 m/s2
c) 5m/s2
d) 34m/s2
18. A boxer hits a 20kg punching bag with a force of 100 Newton’s. What is the force of the bag on the boxer’s hand?
a) The bag does not put a force on the boxer’s hand
b) 10N
c) 200N
d) 100N
Use the following information to answer questions 19 and 20.
A 10kg ball and a 20kg ball are rolled on a smooth, flat, surface without friction. Which statements are true?
19.
a) The balls will continue their path with their original speed and direction
b) The balls will eventually change direction
c) The balls will soon stop
d) The balls will speed up
20.
a) The motion of the 10kg ball will be easier to change
b) The motion of the 20kg ball will be easier to change
c) To change the motion of either ball would be equally difficult
d) It is impossible to change the motion of the balls
Open Response: Answer the questions and explain your answers (5pts. Each)
An elastic cord made for bungee jumping is being tested. A weight of 800 N is attached to one end of the bungee cord.
21. Then the weight is released from a tall tower and it moves downward. When the elastic cord is fully extended, it exerts
an opposing force of 900 N on the weight.
1. Draw and label a force diagram for this situation.
2. Calculate the net force on the weight. Show your calculations and include units in your answer.
3. Explain what would happen if the elastic cord exerted a maximum force of only 700 N on the weight.
22. a) A 5000kg elephant weighs more on the Earth than on the moon. Exaplian why!
b) Find the weight in Newtons of the 5000kg elephant on Earth (g on Earth = 10m/s 2).
c) Find the weight in Newtons of the elephant if it was living on the moon (g on Earth = 10m/s 2).
23. Myra’s car breaks down on the road. Myra and her friend Bill must move the car off the road. The car has a mass of
1,000kg. Myra pushes the car with a force of 300N East, while Bill pulls the car with a 200N force in the same direction.
There is a kinetic force of friction of 130N slowing the movement of the car.
a)
b)
c)
Draw a freebody diagram showing the force vectors
Calculate ∑F
Calculate the acceleration of the object
Extra Credit:
The following are word scrambles from Newton’s Laws of Motion Terms. Unscramble each word and write it on your lined
sheet of paper. 1 extra point for each word unscrambled!
vgitayr
___ ___ ___ ___ ___ ___ ___
Makes things fall
itoifcrin
___ ___ ___ ___ ___ ___ ___ ___ ___
Resistive force
mfa
___=___ ___
This one’s easy!
fecor
___ ___ ___ ___ ___
Easy too!
erbladcneounacf
___ ___ ___ ___ ___ ___ ___ ___ ___ ___
sams
___ ___ ___ ___
If you have matter
you have some of
this
neritia
___ ___ ___ ___ ___ ___ ___
Laziness
tonnew
___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___
Causes acceleration
Made laws of
motion